Respuesta :

justastren

Answer:

The correct answer is the last one, [tex]\frac{\pi }{6}[/tex].

Step-by-step explanation:

Assuming you need this urgently so I won't explain.

Hope this helps:) Goodluck!

Answer:

5π/6, 7π/6

Step-by-step explanation:

Solving :

cos⁻¹ (-[tex]\frac{\sqrt{3} }{2}[/tex])

cos⁻¹ (-cos30°)

cos 30° is negative in Quadrant II and Quadrant III

Value in QII :

  • cos (180° - 30°)
  • cos (150°)
  • 5π/6

Value in QIII :

  • cos (180° + 30°)
  • cos (210°)
  • 7π/6

The answer is 5π/6, 7π/6

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